This study is testing a medicine called mirikizumab to see how well it works for kids with Crohn's Disease (CD). CD is a disease that causes inflammation (swelling and pain) in the digestive tract. The study will last about 74 weeks, which is more than a year, and you'll need to visit the study center up to 19 times. The study is in three parts: a 12-week induction period, a maintenance period for 40 weeks, and a follow-up period for 16 weeks. To join, you must have CD that is active and have tried other treatments without success. You cannot join if you have certain complications like strictures (narrowing of the intestines) or if you've had certain surgeries recently.

• This study lasts about 74 weeks.
• You may have up to 19 visits to the study center.
• There are specific requirements to join, like having tried other treatments.